1. This is a data frame, not a matrix ! -- ?data.frame

2. help.search("sort") is the first thing you should have done. You probably
wouldn't have needed to post if you had.

3. The canonical answer is ?order and indexing  -- as in:

yourdf[order(yourdf$Age),]

Note that order() can be used to sort by more than one column -- e.g. Sex
and then Age within Sex.

4. The orderBy() function in the doBy package -- and probably there are
others -- can do this exactly.

Cheers,

Bert Gunter
Genentech, Inc.

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Angelo Scozzarella
Sent: Thursday, July 10, 2008 11:21 AM
To: r-help@r-project.org
Subject: [R] Sorting a matrix

Hi,

I want to sort a matrix by a specific variable without changing the  
row binding between variables.

Ex.

Name    Sex             Age
Fred    M               24
John    M               18
Mary    F               21


ordered by Age


Name    Sex             Age
John    M               18
Mary    F               21
Fred    M               24



Thanks



Angelo

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